公开(公告)号：EP2266157A1

公开(公告)日：2010-12-29

申请号：EP08873866.1

申请日：2008-12-19

申请人： Ls Mtron Ltd.

发明人： YOUM, Chul ,  OH, Jeong-Hun ,  KIM, Jong-Sung ,  HAN, Kyung-Hee ,  HAN, Jeong-Min

IPC分类号： H01M4/36

CPC分类号： H01M10/0525 ,  H01M4/1393 ,  H01M4/587

摘要： A negative active material for a secondary battery according to the present invention includes a core carbon material and a carbide layer formed on at least a portion of an edge of the core carbon material, and has a difference (an amount of compression density change) of 0.5g/cc or more between a first compression density measured when a pressure of 63.704 MPa is applied for 2 seconds and a second compression density measured when a pressure of 6.3704 MPa is applied for 2 seconds. A secondary battery manufactured using the negative active material according to the present invention can prevent deterioration of characteristics caused by destruction of the carbide layer during a compression process in the manufacture of an electrode of a secondary battery. As a result, a cycle efficiency and a discharging capacity retention rate at a long cycle can be improved.

公开(公告)号：EP2266156A1

公开(公告)日：2010-12-29

申请号：EP08873810.9

申请日：2008-12-19

申请人： Ls Mtron Ltd.

发明人： KIM, Jong-Sung ,  OH, Jeong-Hun ,  YOUM, Chul ,  HAN, Kyung-Hee ,  HAN, Jeong-Min

IPC分类号： H01M4/36

CPC分类号： H01M4/587 ,  H01M4/362 ,  H01M10/0525

摘要： A negative active material for a secondary battery includes a core carbon material, and a carbide layer formed on at least a portion of an edge of the core carbon material, and has a specific surface area ratio of 1.6 or less and a sphericity ratio of 0.6 or more when the negative active material is compressed with a pressure of 1.3 ton per 1 cm2 for 2 seconds. A secondary battery manufactured using the negative active material can prevent deterioration of characteristics caused by destruction of the carbide layer and deformation of core carbon material that may occur during a compression process performed to manufacture an electrode for the secondary battery. As a result, the secondary battery can be improved in aspect of a discharging capacity, a cycle efficiency and a discharging capacity retention rate at a long cycle.